Convert CER To P12 Online for Free


Note: offers online and free SSL certificate format conversion tool without needing any software installation or running the OpenSSL commands. If you would like to convert your CER file to other formats, check CER Converter page.

Converting CER to P12 online is easy using tool

Just follow these steps:

What is CER format?

A .cer file functions as a Secure Sockets Layer (SSL) certificate file, crucial for securing communication between web servers and web browsers. SSL certificates achieve this by encrypting transmitted data, thwarting eavesdroppers from intercepting and deciphering sensitive information.

SSL certificates are broadly categorized into server certificates and client certificates. Web servers utilize server certificates to authenticate themselves to web browsers, while client certificates enable web browsers to authenticate themselves to web servers. While .cer files are primarily associated with server certificates, they can also be employed for client certificates.

To utilize a .cer file, installation on the respective web server or web browser is necessary, with installation procedures varying depending on the software in use. Once installed, the .cer file becomes instrumental in verifying the identity of the counterpart before establishing a secure connection.

For web browsers, the validity of the .cer file can be confirmed by checking the lock icon in the address bar; a green lock icon signifies a valid certificate and a secure connection. On the other hand, web servers can verify .cer file validity by examining error logs, where the absence of errors indicates a valid certificate, signaling the server's readiness to accept connections.

What is P12 format?

A file bearing the '.p12' extension is a security key file associated with the Simple Order API. This extension signifies that the file adheres to the PKCS #12 standard, a part of the Public-Key Cryptography Standards (PKCS) established by RSA Laboratories. Functioning as an archive, a P12 file encompasses all essential cryptographic components.

Within a P12 file, one finds the private key, the public certificate from the Certificate Authority, and all intermediate certificates employed for signing. Notably, a P12 file can include a maximum of 10 intermediate certificates. These files play a pivotal role in securing communications between two applications and serve as a repository for digital certificates, including SSL certificates.

Creating a P12 file involves utilizing tools like OpenSSL, an open-source implementation of the SSL and TLS protocols. Once generated, the P12 file can be employed for securing communications or storing digital certificates.

To secure communications, the P12 file must be installed on both client and server machines. The client uses the P12 file to generate private and public keys, while the server verifies the client's identity using the public key. Alternatively, for storing digital certificates, saving the P12 file to a secure location suffices. Additionally, key management tools can be employed for efficient P12 file management.

P12 files emerge as a secure and practical solution for storing and utilizing digital certificates. They offer a convenient means of ensuring secure communication between applications.

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